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Simplifying 3x + 21 = 4x + 5 Reorder the terms: 21 + 3x = 4x + 5 Reorder the terms: 21 + 3x = 5 + 4x Solving 21 + 3x = 5 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + 3x + -4x = 5 + 4x + -4x Combine like terms: 3x + -4x = -1x 21 + -1x = 5 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -1x = 5 + 0 21 + -1x = 5 Add '-21' to each side of the equation. 21 + -21 + -1x = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 5 + -21 -1x = 5 + -21 Combine like terms: 5 + -21 = -16 -1x = -16 Divide each side by '-1'. x = 16 Simplifying x = 16
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